Buggy code:
protected static ImageIcon _realizationIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Realization" ) ; protected static ImageIcon _classIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Class" ) ; protected static ImageIcon _collaborationIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Collaboration" ) ; protected static ImageIcon _interfaceIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Interface" ) ; protected static ImageIcon _addOpIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "AddOperation" ) ; protected static ImageIcon _addAttrIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "AddAttribute" ) ; protected static ImageIcon _addAssocIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Association" ) ; protected static ImageIcon _packageIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Package" ) ; protected static ImageIcon _modelIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Model" ) ; protected static ImageIcon _innerClassIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "InnerClass" ) ; protected static ImageIcon _nodeIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Node" ) ; protected static ImageIcon _componentIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Component" ) ; protected static ImageIcon _dataTypeIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "DataType" ) ; protected static ImageIcon _actorIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Actor" ) ; protected static ImageIcon _useCaseIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "UseCase" ) ; protected static ImageIcon _extendIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Extend" ) ; protected static ImageIcon _extensionPointIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "ExtensionPoint" ) ; protected static ImageIcon _includeIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Include" ) ; protected static ImageIcon _dependencyIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Dependency" ) ; protected static ImageIcon _permissionIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Permission" ) ; protected static ImageIcon _usageIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Usage" ) ; protected static ImageIcon _parameterIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Parameter" ) ; protected static ImageIcon _operationIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Operation" ) ; protected static ImageIcon _signalIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "SignalSending" ) ; protected static ImageIcon _stereotypeIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Stereotype" ) ; protected static ImageIcon _guardIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Guard" ) ; protected static ImageIcon _transitionIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Transition" ) ; protected static ImageIcon _classifierRoleIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "ClassifierRole" ) ; protected static ImageIcon _associationRoleIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "AssociationRole" ) ; protected static ImageIcon _callActionIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "CallAction" ) ; protected static ImageIcon _interactionIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Interaction" ) ; protected static ImageIcon _actionIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "CallAction" ) ; protected static ImageIcon _receptionIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Reception" ) ; protected static ImageIcon _commentIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Note" ) ; protected static ImageIcon _messageIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Message" ) ; protected static ImageIcon _flowIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "Flow" ) ; protected static ImageIcon _stateMachineIcon = ResourceLoaderWrapper . getResourceLoaderWrapper ( ) . lookupIconResource ( "StateMachine" ) ; private JScrollPane namespaceScroll ; private JComboBox namespaceComboBox ; private JComboBox stereotypeBox ; private JScrollPane supplierDependencyScroll ; private JScrollPane clientDependencyScroll ; private JScrollPane targetFlowScroll ; private JScrollPane sourceFlowScroll ; private JScrollPane constraintScroll ; private JPanel namespaceVisibilityPanel ; private JCheckBox specializationCheckBox ; private JScrollPane elementResidenceScroll ; private JTextField nameTextField ; private static UMLModelElementNamespaceComboBoxModel namespaceComboBoxModel = UMLModelElementNamespaceComboBoxModel . getInstance ( ) ; private static UMLModelElementStereotypeComboBoxModel stereotypeComboBoxModel = new UMLModelElementStereotypeComboBoxModel ( ) ; private static UMLModelElementNamespaceListModel namespaceListModel = new UMLModelElementNamespaceListModel ( ) ; private static UMLModelElementClientDependencyListModel clientDependencyListModel = new UMLModelElementClientDependencyListModel ( ) ; private static UMLModelElementConstraintListModel constraintListModel = new UMLModelElementConstraintListModel ( ) ; private static UMLModelElementElementResidenceListModel elementResidenceListModel = new UMLModelElementElementResidenceListModel ( ) ; private static UMLModelElementNameDocument nameDocument = new UMLModelElementNameDocument ( ) ; private static UMLModelElementSourceFlowListModel sourceFlowListModel = new UMLModelElementSourceFlowListModel ( ) ; private static UMLModelElementSupplierDependencyListModel supplierDependencyListModel = new UMLModelElementSupplierDependencyListModel ( ) ; private static UMLModelElementTargetFlowListModel targetFlowListModel = new UMLModelElementTargetFlowListModel ( ) ; public PropPanelModelElement ( String name , int columns ) { } public PropPanelModelElement ( String name , ImageIcon icon , Orientation orientation ) { } public PropPanelModelElement ( String name , Orientation orientation ) { } public PropPanelModelElement ( String name , ImageIcon icon , int columns ) { } public PropPanelModelElement ( ) { } public void navigateUp ( ) { Object target = getTarget ( ) ; <START_BUG> TheInstance . setTarget ( UmlHelper . getHelper ( ) . getOwner ( getTarget ( ) ) ) ; <END_BUG> } public void navigateNamespace ( ) { } public PropPanel getPropertyPanel ( ) { } public boolean isModuleEnabled ( ) { } public Vector getModulePopUpActions ( Vector v , Object o ) { } public boolean shutdownModule ( ) { } public boolean initializeModule ( ) { } public void setModuleEnabled ( boolean enabled ) { } public boolean inContext ( Object [ ] o ) { } protected JScrollPane getNamespaceScroll ( ) { } protected JComboBox getNamespaceComboBox ( ) { } protected JComboBox getStereotypeBox ( ) { } protected JScrollPane getSupplierDependencyScroll ( ) { } protected JScrollPane getClientDependencyScroll ( ) { } protected JScrollPane getTargetFlowScroll ( ) { } protected JScrollPane getSourceFlowScroll ( ) { } protected JScrollPane getConstraintScroll ( ) { } protected JPanel getNamespaceVisibilityPanel ( ) { } protected JCheckBox getSpecializationCheckBox ( ) { } protected JScrollPane getElementResidenceScroll ( ) { } protected JTextField getNameTextField ( ) { } protected UMLPlainTextDocument getNameDocument ( ) { } }

Fix:
ProjectBrowser . getInstance ( ) . setTarget ( UmlHelper . getHelper ( ) . getOwner ( getTarget ( ) ) ) ;